Definition of unnatural adjective from the Oxford Advanced American Dictionary

     

    unnatural

     adjective
    adjective
    NAmE//ʌnˈnætʃrəl//
     
    , NAmE//ʌnˈnætʃərəl//
     
     
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  1. 1 different from what is normal or expected, or from what is generally accepted as being right It seems unnatural for a child to spend so much time alone. There was an unnatural silence and then a scream. He gave an unnatural smile (= that did not seem genuine).
  2. 2different from anything in nature Her leg was bent at an unnatural angle. an unnatural death (= one not from natural causes) opposite natural
unnaturally
 
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adverb She was,not unnaturally, very surprised at the news. His eyes were unnaturally bright. The room seemed unnaturally quiet. She spoke in an unnaturally high voice.
See the Oxford Advanced Learner's Dictionary entry: unnatural